Re: ATM Active mirror figure correction?

[btk@pacbell.net]

Lawrence Sayre wrote:
> 
> I own a 3/4" thick plate glass Coulter mirror (13.1" dia.) which has a
> smooth figure, but is under corrected.  
> Is it possible to glue a small "swivel level" pad onto the dead center
> of the back side of this mirror (using an appropriate glue, such as the
> glue used to adhere the rear view mirror to a windshield), and then pass
> the swivel level bolt through the back side of the cell (where it would
> be as accessible as the three collimation bolts), and then torque a nut
> on the swivel level bolt to literally pull this thin plate glass mirror
> into a good parabolic curve?  

FYI;

It would not be that hard, especially with guidance from this list, to 
take a undercorrected mirror, strip it, and figure it you self to where 
it would preform much better for you.
A plywood disc, some pitch, and some polishing compound, and even with 
out a tester, you could star test your way in.

Bill
--
Bill Marriott
Woodacre, Ca. USA
btk@pacbell.net

http://www.starlightoptical.com
telescope/optical stuff